Challenges require one thing: discipline. Discipline has nothing to do with being regimented or following very specific routines. Discipline is a mind thing. It is the setting of goals and targets and then just getting down and meeting them. The moment something is in our sights discipline is what will help us achieve it.
From training to fighting to simply getting through life what makes the difference between having a life and just living is the ability to apply discipline and get things done.